Process of making an anthracene dye.



UNliTI El) s rriirns RENE BOHN, OF MANNHEIM. GERMANY,

Parana; OFFEOEQQ.

ASSIGNOR TO BAOISCHE ANILIN CORPORATION.

PROQESSQF MAWNG AM ANTHRACENE DYE Specification of Letters Patent.

Patented Feb. 19, 1907.

Application filed December 4, 1905'. Serial No. 290,247. I

To (all HJILOTH' it Tmay concern:

Be it-known that 1, REM: Bonn, doctor of Ehilosophy and chemist, a citizen of the Swiss epublic, residing at Mannheim, in the Grand Duchy of Baden, German Empire, have invented new and useful Improvements in Processes of Making an Anthracene Dye, of which the following is a s ecilication.

In the specifications of etters Patent Nos. 739,579 and 753,659 are described methods for the production of halogen derivatives of indanthrene, and it is there stated that these coloring-matters are very fast against the action of chlorin.

I have now discovered that by heating ind anthrene with antimony pentachlorid in the presence of a suitable solventsuch,for instance, as nitrobenzene a chlorin derivative of indanthrene can be obtained which possesses all the properties attributed to the coloring-m atter described and claimed in the aforesaid specification of Letters Patent N 0; 739,579, but when prepared according to the process of the present invention yields dyeings which are still faster against the action of chlorin.

The following example will serve to further illustrate the nature of my invention and the way in which it can be carried into practical 1. The process of making a chlorin deriva tive of indanthrene by heating indanthrene with antimony pentachlorid in the presence of a suitable solvent.

2; The process of making a chlorin derivative of indanthrene by heating indanthrene with antimony pentachlorid in the presence of nitrobenzene.

In testimony whereof I have hereunto set 'my hand in the presence of two subscribing witnesses.

RENE BOHN. W itncsses:

J. ALEo. LLOYD, J os. H. LEUTEV. 

